2-2²-2³-2^4-2^5-2^6-2^7-2^8-2^9+2^10 等于多少
问题描述:
2-2²-2³-2^4-2^5-2^6-2^7-2^8-2^9+2^10 等于多少
答
2^n =2*2^(n-1)
2-2²-2³-2^4-2^5-2^6-2^7-2^8-2^9+2^10
=2-2²-2³-2^4-2^5-2^6-2^7-2^8+2^9
=2-2²-2³-2^4-2^5-2^6-2^7+2^8
……
=2+2²=2+4=6